mem-cache: Add data expansion and compaction checking functions

mem-cache: Add data expansion and compaction checking functions

Data expansion and compaction are determined according to the compaction
method being used. Therefore, do the verification on the blocks instead
of the cache.

Change-Id: I652418a5f4c6d5b946a9925d6287a995f262f02a
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/36579
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>